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Seymour is a paternal great-grandfather of Sheldon J. Plankton, the father-in-law of Grand Dad Plankton, the paternal grandfather of Gordon Plankton and Silas Plankton, the grandfather-in-law of Mama Plankton, and also the great-grandfather-in-law of Karen Plankton. He appears in the comic A Plankton Family Tree.
He is an old plankton with four curled arms and legs, two buck teeth, and a pipe in his mouth.
Role in comic
He is a representation of Plankton's family tree.